An external linkage transfers the synchronous rotational movement from the drive arm to the individual blades. Even very large multileaf dampers can be safely opened and closed with this type of linkage.

Opposed action blades close at different speeds since the linkage includes a transverse link. This facilitates the closing process and reduces the closed blade air leakage.

The torque for closing a multileaf damper must be such that the damper can be safely opened and closed.

For closure, the torque must suffice to ensure complete shut-off by the blades.

Opening is initiated without aerodynamic forces.

When air flows through the damper, the aerodynamic forces of the airflow create a closing force (torque) on the blades; this happens independent of the direction of the airflow. This closing force must be countered, or overcome. The blade position, or blade angle α, for which there is the largest torque depends, among other factors, on the fan characteristics.

Nominal sizes

200 × 180 mm – 2000 × 1995 mm

Operating temperature

–20 to 100 °C

JZ-*, JZ-*-A2, minimum torque

H

B [mm]

H

200

400

600

800

1000

1200

1400

1600

1800

2000

mm

Nm

180 – 1995

10

10

10

10

10

10

10

10

10

10

Steel and stainless steel multileaf dampers, free area

H

B [mm]

H

200

400

600

800

1000

1200

1400

1600

1800

2000

mm

m²

180 – 344

0.03

0.06

0.09

0.12

0.15

0.18

0.21

0.24

0.27

0.30

345 – 509

0.06

0.11

0.17

0.23

0.28

0.34

0.40

0.45

0.51

0.57

510 – 674

0.08

0.17

0.25

0.33

0.42

0.50

0.58

0.67

0.75

0.83

675 – 839

0.11

0.22

0.33

0.44

0.55

0.66

0.77

0.88

0.99

1.10

840 – 1004

0.14

0.27

0.41

0.55

0.69

0.82

0.96

1.10

1.23

1.37

1005 – 1169

0.16

0.33

0.49

0.66

0.82

0.98

1.15

1.31

1.47

1.64

1170 – 1334

0.19

0.38

0.57

0.76

0.95

1.14

1.33

1.52

1.72

1.91

1335 – 1499

0.22

0.43

0.65

0.87

1.09

1.30

1.52

1.74

1.96

2.17

1500 – 1664

0.24

0.49

0.73

0.98

1.22

1.47

1.71

1.95

2.20

2.44

1665 – 1829

0.27

0.54

0.81

1.08

1.36

1.63

1.90

2.17

2.44

2.71

1830 – 1994

0.30

0.60

0.89

1.19

1.49

1.79

2.08

2.38

2.68

2.98

1995

0.32

0.65

0.97

1.30

1.62

1.95

2.27

2.60

2.92

3.25

Intermediate sizes: Intermediate widths can be interpolated

Maximum static differential pressure for a closed multileaf damper

Construction

B [mm]

Construction

800

1000

1200

1400

1600

1800

2000

Construction

Δpst max

Construction

Pa

Standard construction

2500

2000

1650

1400

1250

1100

1000

Brass bearings (-M)

3000

2500

2200

1950

1750

1600

1500

Stainless steel bearings (-E)

3000

2500

2200

1950

1750

1600

1500

Reinforced blades (-M-V, -E-V)

3500

3000

2700

2500

2300

2100

2000

JZ-S, JZ-S-A2, sound power level for a closed multileaf damper

Δpst

Area B × H [m²]

Δpst

0.14

0.2

0.4

0.6

0.8

1.2

2

4

Δpst

LWA

Pa

dB(A)

100

57

58

61

63

64

66

68

71

200

63

65

68

69

71

72

75

77

500

71

72

76

78

79

81

83

84

1000

78

80

82

84

85

88

90

>90

1500

81

83

86

88

89

>90

>90

>90

2000

84

85

89

>90

>90

>90

>90

>90

JZ-P, JZ-P-A2, sound power level for a closed multileaf damper

Δpst

Area B × H [m²]

Δpst

0.14

0.2

0.4

0.6

0.8

1.2

2

4

Δpst

LWA

Pa

dB(A)

100

57

58

61

63

64

64

68

71

200

63

65

68

69

71

71

75

78

500

71

72

76

78

79

79

85

87

1000

78

80

82

84

85

85

89

>90

1500

81

82

86

88

89

89

>90

>90

2000

84

86

89

>90

>90

>90

>90

>90

Installation type A

Ducts on both sides

Quick sizing tables provide a good overview of the sound power levels and differential pressures that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme.

The sound power levels LWA apply to multileaf dampers with a cross-sectional area (B × H) of 1 m².

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